California enacted AB2047, titled the California Firearm Printing Prevention Act, which adds a new Title 21.1 to the Civil Code and makes it unlawful to sell or transfer three‑dimensional printers in the state unless they incorporate built‑in "firearm blocking technology." The law was chaptered on September 26, 2026, and directs the California Department of Justice to oversee implementation and compliance. The requirement targets hardware or software that scans digital print files and prevents the manufacture of unserialized homemade firearms and machine‑gun conversion devices.
The statute ties its technical standards to ASTM International: beginning July 2027, the DOJ will periodically check whether ASTM has published industry standards for such blocking technology. If ASTM publishes standards, the DOJ must issue official guidance and minimum performance rules within 24 months, and one year after those rules are issued it will become illegal to sell or transfer printers that do not meet the requirements. The law exempts printers used exclusively to make entertainment props, protects developers who test and refine blocking tools from civil liability when sharing digital firearm code, and includes a severability clause to preserve remaining provisions if any part is struck down.
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